Database

The technical documentation of the database microservice, which stores the data of the application.

2 minute read

Kubernetes resources

StatefulSet: united-manufacturing-hub-timescaledb
Service:
- Internal ClusterIP for the replicas: united-manufacturing-hub-replica at port 5432
- Internal ClusterIP for the config: united-manufacturing-hub-config at port 8008
- External LoadBalancer: united-manufacturing-hub at port 5432
ConfigMap:
- Patroni: united-manufacturing-hub-timescaledb-patroni
- Post init: timescale-post-init
- Postgres BackRest: united-manufacturing-hub-timescaledb-pgbackrest
- Scripts: united-manufacturing-hub-timescaledb-scripts
Secret:
- Certificate: united-manufacturing-hub-certificate
- Patroni credentials: united-manufacturing-hub-credentials
- Users passwords: timescale-post-init-pw
PersistentVolumeClaim:
- Data: storage-volume-united-manufacturing-hub-timescaledb-0
- WAL-E: wal-volume-united-manufacturing-hub-timescaledb-0

Configuration

There is only one parameter that usually needs to be changed: the password used to connect to the database. To do so, set the value of the db_password key in the _000_commonConfig.datastorage section of the Helm chart values file.

Environment variables

Environment variables
Variable name	Description	Type	Allowed values	Default
`BOOTSTRAP_FROM_BACKUP`	Whether to bootstrap the database from a backup or not.	int	0, 1	0
`PATRONI_KUBERNETES_LABELS`	The labels to use to find the pods of the StatefulSet.	string	Any	`{app: united-manufacturing-hub-timescaledb, cluster-name: united-manufacturing-hub, release: united-manufacturing-hub}`
`PATRONI_KUBERNETES_NAMESPACE`	The namespace in which the StatefulSet is deployed.	string	Any	united-manufacturing-hub
`PATRONI_KUBERNETES_POD_IP`	The IP address of the pod.	string	Any	Random IP
`PATRONI_KUBERNETES_PORTS`	The ports to use to connect to the pods.	string	Any	`[{"name": "postgresql", "port": 5432}]`
`PATRONI_NAME`	The name of the pod.	string	Any	united-manufacturing-hub-timescaledb-0
`PATRONI_POSTGRESQL_CONNECT_ADDRESS`	The address to use to connect to the database.	string	Any	$(PATRONI_KUBERNETES_POD_IP):5432
`PATRONI_POSTGRESQL_DATA_DIR`	The directory where the database data is stored.	string	Any	/var/lib/postgresql/data
`PATRONI_REPLICATION_PASSWORD`	The password to use to connect to the database as a replica.	string	Any	Random 16 characters
`PATRONI_REPLICATION_USERNAME`	The username to use to connect to the database as a replica.	string	Any	standby
`PATRONI_RESTAPI_CONNECT_ADDRESS`	The address to use to connect to the REST API.	string	Any	$(PATRONI_KUBERNETES_POD_IP):8008
`PATRONI_SCOPE`	The name of the cluster.	string	Any	united-manufacturing-hub
`PATRONI_SUPERUSER_PASSWORD`	The password to use to connect to the database as the superuser.	string	Any	Random 16 characters
`PATRONI_admin_OPTIONS`	The options to use for the admin user.	string	Comma separated list of options	createrole,createdb
`PATRONI_admin_PASSWORD`	The password to use to connect to the database as the admin user.	string	Any	Random 16 characters
`PGBACKREST_CONFIG`	The path to the configuration file for Postgres BackRest.	string	Any	/etc/pgbackrest/pgbackrest.conf
`PGDATA`	The directory where the database data is stored.	string	Any	$(PATRONI_POSTGRESQL_DATA_DIR)
`PGHOST`	The directory of the runnning database	string	Any	/var/run/postgresql

Last modified November 12, 2024: Merge pull request #308 from united-manufacturing-hub/fix/xxx/correct-opc-ua-simulator-get-started (56093f1)